Faraday effect magnetometry utilizing high Verdet constant glass

Tatam, R. P.; Berwick, M.; Jones, J. D. C.; Jackson, D. A.
September 1987
Applied Physics Letters;9/14/1987, Vol. 51 Issue 11, p864
Academic Journal
A magnetometer based on the Faraday effect is described, in which the sensing element is a rod of high Verdet constant glass. The instrument is capable of remote operation, and may be addressed via a monomode optical fiber. A pseudoheterodyne signal processing technique is used, which utilizes an input beam of rotating linear polarization state. A fiber optic modulator for producing the rotating state is described. Using a high Verdet constant sensing element gives higher sensitivity than can be achieved with a conventional fiber sensing element, increasing the sensitivity by multipassing is also discussed. The instrument has been demonstrated with both static and periodic fields.


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